update hover

Author: xuhuanzy

crates/emmylua_ls/src/handlers/hover/find_origin.rs

@@ -240,6 +240,21 @@ fn resolve_member_owner(
     }
 }
 
+// 判断`table`是否为类
+fn table_is_class(table_type: &LuaType, depth: usize) -> bool {
+    if depth > 10 {
+        return false;
+    }
+    match table_type {
+        LuaType::Ref(_) | LuaType::Def(_) | LuaType::Generic(_) => true,
+        LuaType::Union(union) => union
+            .into_vec()
+            .iter()
+            .any(|typ| table_is_class(typ, depth + 1)),
+        _ => false,
+    }
+}
+
 fn resolve_table_field_through_type_inference(
     semantic_model: &SemanticModel,
     table_field: &LuaTableField,
@@ -248,10 +263,8 @@ fn resolve_table_field_through_type_inference(
     let table_expr = LuaTableExpr::cast(parent)?;
     let table_type = semantic_model.infer_table_should_be(table_expr)?;
 
-    if !matches!(
-        table_type,
-        LuaType::Ref(_) | LuaType::Def(_) | LuaType::Generic(_)
-    ) {
+    // 必须为类我们才搜索其成员
+    if !table_is_class(&table_type, 0) {
         return None;
     }
 

crates/emmylua_ls/src/handlers/test/hover_test.rs

@@ -413,4 +413,32 @@ mod tests {
 
         Ok(())
     }
+
+    #[gtest]
+    fn test_class_with_nil() -> Result<()> {
+        let mut ws = ProviderVirtualWorkspace::new();
+        ws.def(
+            r#"
+            ---@class A
+            ---@field aAnnotation? string a标签
+
+            ---@class B
+            ---@field bAnnotation? string b标签
+            "#,
+        );
+        check!(ws.check_hover(
+            r#"
+            ---@type A|B|nil
+            local defaultOpt = {
+                aAnnota<??>tion = "a",
+            }
+            "#,
+            VirtualHoverResult {
+                value:
+                    "```lua\n(field) aAnnotation: string = \"a\"\n```\n\n---\n\na标签".to_string(),
+            },
+        ));
+
+        Ok(())
+    }
 }